/Engine/Plugins/Runtime/Metasound/Source/MetasoundFrontend/Public/MetasoundTrigger.h
Executes a desired number of frames and calls underlying InPreTrigger and InOnTrigger functions with frame indices.
template<typename PreTriggerType, typename OnTriggerType> void LookAhead ( int32 InNumFrames, PreTriggerType InPreTrigger, OnTriggerType InOnTrigger ) const